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UNITED STATES PATENT @EEIGE.

JOSEPH BULOVA, OF NEW YORK, N. Y.

PROCESS OF MAKlNG ALLOYED RAlSED GOLD PLATES WITH CORRUGATED BACKGROUNDFOR JEWELRY.

SPECIFICATION forming part of Letters Patent No. 412,017, dated October1, 1889. Application filed July 19, 1839. Serial No, 318,049 (Nospecimens.)

To aZZ whom it may concern.-

Be it known that I, JOSEPH BULOVA, of New York city, New York, haveinvented an Improved Process of Making Alloyed Raised Gold Plates withCorrugated Background for Jewelry, of which the following is aspecification.

This invention relates to an improved process for making gold plates ofthe kind in which an ornament or initial is raised from a roughened orcorrugated background. This class of plates is used in the manufactureof rings, locket-s, chains, and similar articles. These plates wereheretofore made by placing a softened alloyed gold plate, with itsoxidized coat 'or surface, in a die from which the raised figure orornament alone was struck up. The oxide was next removed from thebackground by scraping, and then the corrugations were formed upon thebackground by a chisel or punch. Finally, the raised parts or ornamentswere polished. The diificulties accompanying this process were so manythat plates of this kind were rarely made. The removal of the oxide byscraping around the raised parts was accompanied with much difficulty.The corrugation of the background by hand was also a tedious process,and the corrugations were not apt to be uniform. Moreover, dirt was aptto settle in the cavities, as the punch in forming the background wasapt to throw the diminutive lips formed in one descent partly over theadjacent cavities to partly close them.

I overcome all of the above objections and produce an alloyed-gold plateof the kind described in a cheap manner and in perfect form by thefollowing process:

The alloyed gold plate is annealed, and then while the plate is stillsmooth the oxidized coat upon its surface is carefully re moved by emeryor by a similar polishing material. This gives to the annealed-goldplate its natural clean color. The plate is next placed in a female die,which contains the ornament or initial to be produced. The lower surfaceor background of the die is corrugated to correspond to the corrugationsto be produced upon the annealed-gold plate. Pressure being applied, theannealed-gold plate will receive its raised ornament or initial, and atthe same time its corrugated or roughened background. The raised partsof the plate are now polished, while the groundwork is perfect infinish, and need not be scraped or operated upon in any manner. Thus theplate is ready to be used in the manufacture of jewelry without beingsubjected to further manipulation hat I claim is- The process ofproducing alloyed raised gold plates with corrugated background, whichconsists in annealing the alloyed-gold plate, removing the oxide fromits surface, stamping it out in a female die containing the raisedornament and the corrugated background, and then polishing the raisedornament, substantially as specified.

JOSEPH BULOVA.

Witnesses:

A. JONGHMANS,

F. v. BRIESEN.

